Prophet Mohammad (PBUH) was asked, 'Which part of the Qur'an is the best?'. He
replied, 'The Surah in which the Baqara (cow) is mentioned'. He was then asked
'Which part of that Surah?'. He replied, 'The verse of the Throne (Ayatul Kursi)
and the last part of Surrah Al Baqara came down from under the Throne'

Surah Mulk or Tabarakalazi Jabir (radiAllahu
anhu) said it was the custom of the Holy Prophet sallallahu alaihe wasallam not
to go to sleep until he had read Tabarakalladhi Biyadihil Mulk and Alif Laam
Meem Tanzeel. [Ahmad, Tirmidhi and Darami]